Function SendFakePing

library/cpp/netliba/v6/udp_client_server.cpp:678–685

not MTU discovery, just figure out IB address of the peer

    // not MTU discovery, just figure out IB address of the peer
    static void SendFakePing(TNetSocket& s, const sockaddr_in6& toAddress, int selfNetworkOrderPort) {
        char buf[100];
        char* pktData = buf + UDP_LOW_LEVEL_HEADER_SIZE;
        Write(&pktData, (int)0);
        Write(&pktData, (char)PING);
        Write(&pktData, selfNetworkOrderPort);
        s.SendTo(buf, (int)(pktData - buf), toAddress, FF_ALLOW_FRAG);
    }

    void TUdpHost::SendData(TList<TTransferKey>* order, float deltaT1, bool needCheckAlive) {
        for (TList<TTransferKey>::iterator z = order->begin(); z != order->end();) {